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Revenues and Deferred Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Disaggregation Of Revenue [Abstract] |
Schedule of Disaggregation of Revenue | disaggregated revenues by types were as follows:
|  | Years ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | RMB |  |  | RMB |  |  | RMB |
Disaggregation of revenues |  |  |  |  |  |  |  |  |  |  |  |
Revenue by types: |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues: |  |  |  |  |  |  |  |  |  |  |  |
Degree- or diploma-oriented post-secondary courses |  |  | 822,832 |  |  |  | 1,814,178 |  |  |  | 2,021,990 |
Professional certification preparation and professional skills courses |  |  | 145,840 |  |  |  | 161,366 |  |  |  | 155,370 |
Subtotal Online educational courses |  |  | 968,672 |  |  |  | 1,975,544 |  |  |  | 2,177,360 |
Commissions |  |  | 4,105 |  |  |  | 6,374 |  |  |  | 15,381 |
Others |  |  | 1,901 |  |  |  | 587 |  |  |  | 8,100 |
Total revenues |  |  | 974,678 |  |  |  | 1,982,505 |  |  |  | 2,200,841 |
Less: sales tax and surcharges |  |  | (4,516 | ) |  |  | (8,520 | ) |  |  | (6,939 | )
Total net revenues |  |  | 970,162 |  |  |  | 1,973,985 |  |  |  | 2,193,902 |
Schedule of Movements of the Deferred Revenue | The movements of the deferred revenue for the years ended December 31, 2018 and 2019 were as follows (1):
|  | As of December 31, |
|  | 2018 |  |  | 2019 |
|  | RMB |  |  | RMB |
Beginning balance (current and noncurrent) |  |  | 2,110,428 |  |  |  | 3,286,025 |
Additions |  |  | 3,214,400 |  |  |  | 2,236,638 |
Deductions |  |  | (2,038,803 | ) |  |  | (2,293,893 | )
Ending balance (current and noncurrent) |  |  | 3,286,025 |  |  |  | 3,228,770 |
Deferred revenue, current |  |  | 1,765,085 |  |  |  | 1,670,076 |
Deferred revenue, non-current |  |  | 1,520,940 |  |  |  | 1,558,694 |
| (1) | Amounts presented are inclusive of VAT (see VAT in Note 2).

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